Three-quarters mile southeast of Hot Springs (Jurassic of the United States)

Where: South Dakota (43.4° N, 103.5° W: paleocoordinates 35.0° N, 45.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Canyon Springs Sandstone Member (Sundance Formation), Bathonian (168.3 - 166.1 Ma)

• Comparison of the stratigraphic section measured by Darton (1899, p. 389) in the vicinity of the Catholicon Springs Hotel with those by Wolcott (1967) and by Rautman (1975) near the town of Minnekahta (12 mi or 19 km west of Hot Springs) suggests that the fish collected by Darton were derived from the upper part of the Canyon Springs Sandstone.

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; lithified, fine-grained sandstone

• Soft, fine-grained, thin-bedded (laminated) sandstone

Size class: macrofossils

Preservation: adpression

Collected by N.H. Darton in 1898

Primary reference: C. R. Eastman. 1899. Jurassic fishes from Black Hills of South Dakota. Geological Society America Bulletin 10:397-408 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 122622: authorized by Matthew Clapham, entered by Matthew Clapham on 04.01.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

Actinopteri
 Amiiformes - Caturidae
"Amiopsis dartoni n. sp." = Caturus dartoni
"Amiopsis dartoni n. sp." = Caturus dartoni Eastman 1899 bowfin
 Halecostomi -
"Pholidophorus americanus n. sp." = Hulettia americana
"Pholidophorus americanus n. sp." = Hulettia americana Eastman 1899